HYDROLYSIS OF FLUORESCEIN DIACETATE IN SPHAGNUM PEAT CONTAINER MEDIA FOR PREDICTING SUPPRESSIVENESS TO DAMPING-OFF CAUSED BY PYTHIUM-ULTIMUM

被引:81
作者
INBAR, Y [1 ]
BOEHM, MJ [1 ]
HOITINK, HAJ [1 ]
机构
[1] OHIO STATE UNIV, OHIO AGR RES & DEV CTR, DEPT PLANT PATHOL, WOOSTER, OH 44691 USA
关键词
D O I
10.1016/0038-0717(91)90013-A
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Microbial activity, based on the rate of hydrolysis of fluorescein diacetate (FDA), accurately predicted suppressiveness to Pythium damping-off of cucumber in media containing light-colored, relatively nondecomposed Canadian sphagnum peat. Suppressiveness was directly related to the quantity of FDA hydrolysed. Organic matter in container media adsorbed fluorescein. Adsorption was directly related to peat decomposition level. In media prepared with dark, decomposed sphagnum peats, that are H3-H4 or higher on the von Post scale, adsorption of fluorescein was strong enough to interfere with the assay. Since such decomposed peats were consistently conducive, the procedure did not yield false readings even here.
引用
收藏
页码:479 / 483
页数:5
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